Water-tube boiler.



J. A. SCOTT.

WATER TUBE BOILER.

APPLCAT|0N FILED MAR. 18. 19M.

1,1 58,865. Patented Nov. 2, 1915.

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. ATTUR/Vfy COLUMBIA PLANOGRAPH co., WASHINGTON, D. c.

J. A. SCOTT.

WATER TUBE BOILER.

APPLICATION FILED MAR. I8, 1914.

Patented Nov. 2, 1915.

2 SHEETS-SHEET 2.

WITNESSES.

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WATER-TUBE BOILER.

Specification of Letters Patent.

Patented Nov. 2, 1915.

Application filed March 18, 1914. Serial No. 825,495.

To all whom it may concern Be ,it known that I, JOSEPH ALvAH Soon, a citizen of the United States, residing at Seattle, in the county of King and State of Washington, have invented certain new and useful Improvements in Water-Tube Boilers, of which the following is a specification.

This invention relates to water tube boilers, and especially to improvements in boilers such as shown and described in United States Patent No. 7 00,248, issued to me May 20, 1902. I v

The object of the invention is to improve the efliciency of boilers of this class and affording a construction which will facilitate the repair of the boiler by rendering the heating-tubes readily accessible for-cleaning and for the removal and replacing 0f the tubes.

The invention is illustrated in the accompanying drawings, in which V Figure 1 is a view partly in front elevae tion and partly in vertical transverse section of a boiler embodying the present invention. Fig. 2 is a vertical longitudinal section taken on line 22 of Fig. 1, and with parts omitted. .Fig. 3 is a detail horizontal sectional view illustrating the disposition and means for securing the baffle-bars in place. Figs. 4: and 5 are vertical sectional views on lines 1- 1 and 55 of Fig. 3. Fig 6 is a fragmentary elevational view of Fig. 4- in the direction indicated by arrow. Fig. 7 is a similar view with respect to Fig. 5.

The reference numeral 10 designates a steam drum which is connected by an assembly or bank of inclined water-tubes, such as 12, with a mud drum 13 in each side of the furnace 14. The central portions of said water-tubes are straight,or nearly so, and are provided with curved endsto enter the respective drums in directions approximately radially thereof and to which the tubes are connected by expanding their eX- tremities in awell-known manner.

According to the present invention, the tubes of a bank are arranged in groups of two transverse rows with relatively narrow spaces A between the rows of each such group. The spaces B between the groups,

however, are sufficiently wide to afford a convenient passage for tubes which are to be introduced in or withdrawn from the rows of tubes at either side of the spaces B. The spaces A and B serve, moreover, as channels'for the flow of the hot gaseous combustion products from the furnace 14 to a flue 15 provided at the outer side of a bank of tubes between a partition 21 and the adjacent wall 16 of the boiler casing. The side walls 16 are desirably made removable to give access to the respective flues.

17 represents a smoke uptake connecting the flues at opposite sides of the boiler with the stack connection 18. Intermediate its height a bank of tubes has its wide spaces B closed at the outer ends of the latter by means of bars 19 which are triangular or of an arcuate shape in. horizontal section so as to extend into said spaces and bear upon the tubes at each side of the same. Said bars are held in juxtaposition with the tubes by means of a rail 20 at the bottom and an overlapping edge of a partition 21 at the top.. The rail 20 is secured by bolts 22 to stirrup plates 23 which are positioned against the remote sides of the adjacent tubes (Fig. 3) and extend through holes provided in the respective bars. By such devices the bar at each of the bolts 22 is supported by the latter. ihe remaining bars are supported by bolts 24 which engage in holes provided therefor in the bars and the rail.

All of the aforesaid bolts are screwthreaded at their outer ends for engagement with nuts 22 and 2 1 To prevent the rotationof the bolts 24 when screwing on or withdrawing the nuts, recesses 25 (see Figs. a-and are provided in the bars to receive the bolt heads and are of such widths as to interfere with the turning of the heads.

The turning of the other bolts 22 may be prevented by having the heads of the same encounter offset portions, as 23 of the stirrup plates.

A partition 21 is detachably secured in place by means of screw-bolts 26 engaging in the drum at the top and to stirrup plates below. Said partitions are, moreover, desirably provided with perforations 27 to afford direct and relatively small passages there through from the upper portion of the furnace into the fines 15 so as to establish a general outward movement to the hot gases which ascend into the space between said partitions prior to the descent of the main body of the gas which enters the flues from below. p

In operation, the hot gases from the furnace enter the spaces about the various tubes to heat the same for the generation of steam; the hotter gases, however, ascend into the space unoccupied by the tubes between the partitions, but through the office of such partitions and the suction created by the chimney draft, the hot gases are caused to doscend tomingle with the hot gases within the spaces between the tubes and subjacent to the partitions upon each side of the boiler. By reason of the communication between the wide spaces B and a flue 15 being closed. by the bars 19, the exits for the smoke or gases to such flue are effected principally through the narrow spaces A, resulting in rapid outfiowing currents therein, which creates a better circulation of the hot gases among the various tubes. It is thus seen that the partitions furnish receptacles, so to speak, about the upper ends of the tubes in which the hot ter gases, subject to the relatively small currents which escape through the perforations 27, are entrapped in their travel to the flues to afford time for the delivery of a large portion of the heat from the gases to the drum 10 and the upper ends of the tubes, while a large part of the remainder of the heat of the gases, in their flow to the fines, is to a great extent delivered to the lower portions of the tubes. I

The advantages of disposing the tubes to provide the alternate wide spaces are twofoldfirst, to furnish more room for the distribution of the hot gases among the tubes; and secondly, to provide spaces whereby tubes, upon occasion, may be conveniently removed from and replaced in every row of either bank.

'I/Vhat I claim as my invention, is

1. In a boiler of the class described, in combination, a casing having a stack connection'at its top, a furnace within the easing, a steam drum above said furnace, partitions extending downwardly at opposite sides of said drum and in spaced relations to the side walls of the casing to provide a flue between each partition and the adjacent side wall of the casing, saidflues communicating from above with said stack tively connecting said mud-drums with the steam drum andextending through the space between said partitions, each of said banks of tubes being arranged to afiord alternate casing, and serving therewith to afford at each side of the drum flue connections between the boiler furnaceand said chimney connection, through the perforation of said partitions and also by the passages obtain ing below the lower ends of thelatte'r, said partitions also serving with said-drum to provide the top of said furnace, amud drum tubes comprising rows positioned to'aiford alternate wide'and narrow spaces between said rows, a. partition extending down wardly from the steam drum to inclose the upper ends of both banks of tubes, bars'removably secured to the. plates and closing the wide spaces between the rows of tubes for a distancebelow the respective partition, and a railsecured to saidbars and serving tosecure the latter in fixed spaced relation.

4. In a boiler of the class described, in combination, a casing having removable side walls, a furnace, a steam drum disposed above'the furnace, mud drums at opposite sides of the furnace, banks of water-tubes connecting thev steamdrum with the mud drums and comprising groups of'tubes with relatively wide spaces between the adjacent groups of each bank, partitions arranged with respect to said casing to'afford' upflow fiues at the'opposite sides of the boiler,'said partitions being perforated, whereby aportion of the hot gases ascending from the furnace into the space between the partitions may escape through such perforations into said flueswhile the remainder of such gases is caused to flow downwardly in all the spaces amongthe tubes, and'bars depending from the respective partitions serving to direct such downflowing gases to escape to the fines principally through the spaces obtaining within the aforesaid groupsof pipes.

5. In a boiler of the class described, in combination, a casing, afurnace within the casing, a steam drum directly abovethe furnace, mud drums at opposite sides of the furnace, banks of tubes connecting the steam masses :2:

and mud drums, and perforated partitions extending downwardly from the steam drum at the outside of each of said banks of tubes and constituting With the adjacent side Walls of the casing opposingwalis of upflow fines, the perforations of said baflie-plates serving for the passage of a portion of the hot gases to said fiues While the remainder of such gases enter the lower ends of the flues by diving under the respective partitions.

Signed at Seattle, Wash, this 7th day of March, 1914:.

JOSEPH ALVAH SCOTT. Witnesses:

HORACE BARNEs, E. PETERSON.

Copies of this patent may be obtained for five cents each, by addressing; the Commissioner of Patents,

Washington, D. 0. 

